Hot melt gun



FIG. 1 is a left elevational side view of the ornamental design of a hotmelt gun, showing my new design;

FIG. 2 is a right elevational side view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

An ornamental design for a hot melt gun, as shown and described.